Multipurpose Abacus
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United States of America Patent
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Issued Date -
Nov 13, 2008
app pub date -
May 24, 2006
filing date -
Oct 13, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A multipurpose abacus is disclosed. The multipurpose abacus of the present invention includes an abacus frame, which is closed at the bottom thereof and has upper, lower, left and right frame walls (10), (30), (20), (40). Support rod insertion holes (11) and (31) are respectively formed in the upper and lower frame walls. Partition bar insertion parts (21) and (41) are respectively provided on the right and left frame walls. Supports (51) are provided on the bottom plate (50) at positions corresponding to the partition bar insertion parts. The multipurpose abacus further includes a plurality of support rods (80), which are inserted into the support rod insertion holes of the upper and lower frame walls, a plurality of beads (90), which are fitted over each support rod, and at least one partition bar (60), which is removably inserted into the partition bar insertion parts of the left and right frame walls.
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